US6935729B2 - Ink replenishment system and method for a continuous flow ink jet printer - Google Patents
Ink replenishment system and method for a continuous flow ink jet printer Download PDFInfo
- Publication number
- US6935729B2 US6935729B2 US10/650,214 US65021403A US6935729B2 US 6935729 B2 US6935729 B2 US 6935729B2 US 65021403 A US65021403 A US 65021403A US 6935729 B2 US6935729 B2 US 6935729B2
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- Prior art keywords
- ink
- replenishment
- pressure
- fluid
- tank
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/18—Ink recirculation systems
Definitions
- the present invention relates generally to ink replenishment systems, and more specifically to an ink replenishment system and method for a continuous flow ink jet printer using pressure feedback.
- Ink jet is a non-impact dot-matrix printing technology in which droplets of ink are jetted from a small aperture directly to a specified position on a media to create an image.
- Continuous flow ink jet printing involves a process in which a stream of ink is broken into droplets of uniform size and spacing and passed through an electrical charge. The charged drops are deflected into a gutter for recirculation, and the uncharged drops fly directly onto the media to form an image.
- the amount of replenishment fluid that flows to the ink tank is controlled using some type of manual adjustment.
- the valve connecting the replenishment tank to the ink tank allows a fixed amount of replenishment fluid to enter the ink tank during periodic activations of the valve.
- fluctuations in external conditions, such as humidity can significantly impact the amount of required replenishment fluid. Accordingly, incorrect viscosity can occur over relatively short durations and result in print failure.
- the present invention addresses the above-mentioned problems, as well as others, by providing an ink replenishment system and method for a continuous flow ink jet printer that uses pressure feedback data to regulate the amount of replenishment fluid to be added to the ink tank.
- the invention provides a continuous flow ink jet printer, comprising: a nozzle that receives ink from a supply line and generates ink drops; an ink tank for providing ink to the supply line; an ink gutter for recirculating unused ink drops back to the ink tank; a replenishment tank that provides replenishment fluid for the ink tank; and a control system that controls the flow of replenishment fluid to the ink tank based on an ink pressure along the flow line.
- the invention provides a replenishment system for supplying replenishment fluid to a supply tank, wherein the supply tank includes a supply line to supply a source fluid to a work piece and a return line to receive unused source fluid, the system comprising: a replenishment tank that provides replenishment fluid for the supply tank, wherein the replenishment fluid adjusts a viscosity of the source fluid; a valve that activates a flow of replenishment fluid into the supply tank; and a control system that controls the activation of the valve based on a pressure in the supply line proximate the work piece.
- the invention provides a method for supplying replenishment fluid to an ink tank, wherein the ink tank includes a supply line to supply ink to a nozzle and a return line to receive unused ink, the method comprising: periodically using a control system to recalibrate the ink pressure along the supply line to obtain an optimal print quality; and after the ink pressure has been recalibrated, using the control system to automatically adjust a supply rate of the replenishment fluid to the ink tank, wherein the supply rate of the replenishment fluid is adjusted based on the recalibrated ink pressure.
- FIG. 1 depicts a diagram of a continuous flow ink jet printer having a replenishment system in accordance with the present invention.
- FIG. 2 depicts a flow diagram of a method for implementing a replenishment system in accordance with the present invention.
- FIG. 1 depicts a diagram of a continuous flow ink jet printer 10 that utilizes a replenishment system in accordance with the present invention.
- Printer 10 includes an ink tank 12 for storing a source fluid, in this case, ink.
- the ink from the ink tank 12 is pumped to a nozzle 18 using a motor 16 via a supply line 14 .
- ink drops 19 are sprayed onto a receiving medium, e.g., paper, in a controlled manner.
- a certain portion of ink drops 19 that are unused during spraying are collected in an ink gutter 20 and recirculated back to the ink tank 12 .
- water contained in the ink can be evaporated as the ink flows through the nozzle 18 . Accordingly, the recirculated ink may alter the viscosity of the ink in the ink tank 12 .
- replenishment fluid is injected into the ink tank 12 .
- the replenishment fluid flows from a replenishment tank 22 , through a valve 24 and into the ink tank 12 .
- the amount of replenishment fluid added to the ink tank 12 is controlled by periodically activating the valve 24 to allow replenishment fluid to pass to the ink tank 12 for a predetermined length of time.
- Activation of valve 24 is automatically controlled by controller 28 , and can be activated in any manner, e.g., with a solenoid 26 .
- Controller 28 has two functions, namely (1) to regulate the pressure in the flow line 14 , and (2) to control the replenishment rate of replenishment fluid.
- controller 28 periodically recalibrates the pressure in the supply line 14 until an optimum printing is achieved.
- Algorithms for calculating optimum printing based on sensed pressure are known in the art and the process for regulating pressure may be implemented in any manner.
- the exemplary embodiment shown in FIG. 1 utilizes a pressure sensor 30 that senses a pressure proximate the nozzle 18 , a pressure regulator 32 , and a stepper motor 34 that steps up or down the pressure at the pressure regulator 32 based on feedback from controller 28 .
- Pressure is regulated in this manner periodically, e.g., when new ink is added, during printer recalibrations, etc. Thus, the pressure is changed from time to time to ensure optimum print quality is achieved.
- a printer may be recalibrated every 24 hours to provide the correct pressure.
- the present invention is not limited to a specific recalibration period.
- the second function provided by the controller 28 is to control the replenishment rate of the replenishment fluid to the ink tank based on the pressure in the supply line 14 . Specifically, once a recalibrated pressure value is determined, which will result in optimum printing, the controller 28 uses the value to calculate a new replenishment rate for the replenishment fluid, based on an algorithm 29 . Thus, the replenishment rate of the replenishment fluid is automatically changed whenever a new pressure is applied to the supply line 14 .
- the replenishment rate is implemented by varying the time interval Ti between injections.
- Ti the time interval between injections.
- the pressure regulator 32 is adjusted under program control until optimum printing is detected.
- the resultant nozzle pressure is sensed by the pressure sensor 30 and is recorded by an algorithm 29 in controller 28 as new ink pressure, Pn.
- the replenishment rate for the replenishment fluid when new ink is added may be set in any manner, e.g., manually via the controller 28 based on a manufacturer's recommendation, etc.
- a recalibration of the supply line pressure is thereafter conducted periodically, e.g., every 24 hours, and the recalibrated pressure Pr is also sensed and captured by the algorithm 29 .
- a replenishment rate is then calculated by the algorithm 29 based on a difference between new ink pressure Pn and the current recalibrated pressure Pr.
- the normal evaporation rate En (ml/hr)
- the volume of fluid Vi (ml), injected per time interval Tn (seconds), is therefore also known.
- the recalibrated pressure Pr is read.
- the difference between the recalibrated pressure, Pr and the new ink pressure Pn is calculated. This difference can be used to find the volume of fluid to be added or withheld until the next recalibration to bring the pressure back to new ink pressure.
- the volume of fluid delta, Vd is:
- Vd (ml) ( Pr ⁇ Pn )* Vp
- step S 1 new ink is added to the printer, and an initial replenishment rate is set for the ink replenishment system.
- the ink pressure is changed using a feedback controller and stepper motor to achieve optimum print quality.
- the new ink pressure value Pn is saved at step S 3 .
- step S 4 the ink pressure is periodically recalibrated to achieve optimum print quality, and the recalibrated pressure value Pr is saved at step S 5 .
- step S 6 after each recalibration, the controller is used to calculate a new replenishment rate for the ink replenishment system based on a difference Pr ⁇ Pn.
- step S 7 the new replenishment rate is used to control the ink injection into the ink tank until the next recalibration.
- controller 28 described herein can be implemented in hardware, software, or a combination of hardware and software. It may be implemented by any type of computer system or other apparatus adapted for carrying out the methods described herein.
- a typical combination of hardware and software could be a general-purpose computer system with a computer program that, when loaded and executed, controls the computer system such that it carries out the methods described herein.
- a specific use computer containing specialized hardware for carrying out one or more of the functional tasks of the invention could be utilized.
- the present invention can also be embedded in a computer program product, which comprises all the features enabling the implementation of the methods and functions described herein, and which—when loaded in a computer system—is able to carry out these methods and functions.
- Computer program, software program, program, program product, or software in the present context mean any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: (a) conversion to another language, code or notation; and/or (b) reproduction in a different material form.
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- Ink Jet (AREA)
Abstract
Description
Tn(seconds)=(Vi/En)*3600 sec/hr
Ni=Vd/Vi
Assuming 24 hours between recalibrations, the time period delta Td between injections is:
Td(seconds)=(24 hr*3600 seconds/hr)/Ni
This is the time delta to alter the time of nominal evaporation rate, Tn. The resultant injection time interval, Ti is:
Ti=Tn−Td.
Thus, if the recalibrated pressure Pr is higher indicating thicker ink, the injection time interval, Ti should decrease to inject replenishment fluid at a faster rate.
Claims (20)
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US10/650,214 US6935729B2 (en) | 2003-08-28 | 2003-08-28 | Ink replenishment system and method for a continuous flow ink jet printer |
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US10/650,214 US6935729B2 (en) | 2003-08-28 | 2003-08-28 | Ink replenishment system and method for a continuous flow ink jet printer |
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US20050057627A1 US20050057627A1 (en) | 2005-03-17 |
US6935729B2 true US6935729B2 (en) | 2005-08-30 |
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US10/650,214 Expired - Lifetime US6935729B2 (en) | 2003-08-28 | 2003-08-28 | Ink replenishment system and method for a continuous flow ink jet printer |
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Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060215000A1 (en) * | 2005-03-28 | 2006-09-28 | Fuji Photo Film Co., Ltd. | Ink-jet recording apparatus, ink container, and method of filling ink container |
US20070097160A1 (en) * | 2005-10-31 | 2007-05-03 | Lyman Dan C | Inkjet printer with spill detection |
US20070188542A1 (en) * | 2006-02-03 | 2007-08-16 | Kanfoush Dan E | Apparatus and method for cleaning an inkjet printhead |
US20090021542A1 (en) * | 2007-06-29 | 2009-01-22 | Kanfoush Dan E | System and method for fluid transmission and temperature regulation in an inkjet printing system |
WO2010044773A1 (en) * | 2008-10-14 | 2010-04-22 | Hewlett-Packard Development Company, L.P. | Fluid-jet dispensing device |
US20110007106A1 (en) * | 2008-03-07 | 2011-01-13 | Agfa Graphics Nv | Ink supply system without pump, for ink jet printer with ink recirculation system |
US20110063345A1 (en) * | 2008-05-14 | 2011-03-17 | Francesc Ros Cerro | Printer ink delivery systems |
US20110063346A1 (en) * | 2008-05-14 | 2011-03-17 | Richard Lewis | Printer ink delivery systems |
US20110242156A1 (en) * | 2010-04-01 | 2011-10-06 | Riso Kagaku Corporation | Inkjet printer |
US20120105520A1 (en) * | 2010-10-27 | 2012-05-03 | Riso Kagaku Corporation | Inkjet image forming apparatus |
US20140253616A1 (en) * | 2013-03-06 | 2014-09-11 | E I Du Pont De Nemours And Company | System and process for liquid replenishment for a printing apparatus for depositing a liquid composition on a backplane |
US20140326333A1 (en) * | 2013-05-06 | 2014-11-06 | E I Du Pont De Nemours And Company | Liquid replenishment system for a printing apparatus for depositing a liquid composition on a backplane including a dispensing vessel having a self-supporting secondary container |
US8888208B2 (en) | 2012-04-27 | 2014-11-18 | R.R. Donnelley & Sons Company | System and method for removing air from an inkjet cartridge and an ink supply line |
US20160368015A1 (en) * | 2014-10-01 | 2016-12-22 | Sekisui Chemical Co., Ltd. | Liquid ejection device |
US10124597B2 (en) | 2016-05-09 | 2018-11-13 | R.R. Donnelley & Sons Company | System and method for supplying ink to an inkjet printhead |
US10137691B2 (en) | 2016-03-04 | 2018-11-27 | R.R. Donnelley & Sons Company | Printhead maintenance station and method of operating same |
US10195867B2 (en) | 2014-11-14 | 2019-02-05 | Hewlett-Packard Development Company, L.P. | First and second reservoirs for printable compositions |
Families Citing this family (6)
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US7207665B2 (en) * | 2004-05-05 | 2007-04-24 | Eastman Kodak Company | Method for establishing jets for an ink jet printhead |
JP5215376B2 (en) * | 2010-12-27 | 2013-06-19 | 富士ゼロックス株式会社 | Liquid circulation device, liquid circulation control program, liquid ejection device |
FR3003799B1 (en) | 2013-03-29 | 2016-01-22 | Markem Imaje | METHOD AND DEVICE FOR REGULATING A PUMP OF AN INK CIRCUIT |
FR3003798B1 (en) | 2013-03-29 | 2015-10-30 | Markem Imaje | LOW COST INK CIRCUIT |
FR3026050A1 (en) | 2014-09-18 | 2016-03-25 | Markem Imaje Holding | INK CIRCUIT FOR PIGMENT INKS |
US10994552B2 (en) | 2017-04-21 | 2021-05-04 | Hewlett-Packard Development Company, L.P. | Recirculation of a fluid in a printer |
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Cited By (30)
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US7553004B2 (en) * | 2005-03-28 | 2009-06-30 | Fujifilm Corporation | Ink-jet recording apparatus, ink container, and method of filling ink container |
US20060215000A1 (en) * | 2005-03-28 | 2006-09-28 | Fuji Photo Film Co., Ltd. | Ink-jet recording apparatus, ink container, and method of filling ink container |
US20070097160A1 (en) * | 2005-10-31 | 2007-05-03 | Lyman Dan C | Inkjet printer with spill detection |
US7635173B2 (en) * | 2005-10-31 | 2009-12-22 | Eastman Kodak Company | Inkjet printer with spill detection |
US7918530B2 (en) | 2006-02-03 | 2011-04-05 | Rr Donnelley | Apparatus and method for cleaning an inkjet printhead |
US20070188542A1 (en) * | 2006-02-03 | 2007-08-16 | Kanfoush Dan E | Apparatus and method for cleaning an inkjet printhead |
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US8292385B2 (en) * | 2008-03-07 | 2012-10-23 | Agfa Graphics Nv | Ink supply system without pump, for ink jet printer with ink recirculation system |
US20110007106A1 (en) * | 2008-03-07 | 2011-01-13 | Agfa Graphics Nv | Ink supply system without pump, for ink jet printer with ink recirculation system |
US8696080B2 (en) * | 2008-05-14 | 2014-04-15 | Hewlett-Packard Development Company, L.P. | Printer ink delivery with refill line pressure sensor |
US20110063346A1 (en) * | 2008-05-14 | 2011-03-17 | Richard Lewis | Printer ink delivery systems |
US20110063345A1 (en) * | 2008-05-14 | 2011-03-17 | Francesc Ros Cerro | Printer ink delivery systems |
US8424986B2 (en) * | 2008-05-14 | 2013-04-23 | Hewlett-Packard Development Company, L.P. | Printer ink delivery system with intermediate buffer ink tanks |
US20110164080A1 (en) * | 2008-10-14 | 2011-07-07 | Hewlett-Packard Development Company, Lp. | Fluid-jet dispensing device |
WO2010044773A1 (en) * | 2008-10-14 | 2010-04-22 | Hewlett-Packard Development Company, L.P. | Fluid-jet dispensing device |
CN102186675B (en) * | 2008-10-14 | 2014-05-14 | 惠普开发有限公司 | Fluid-jet dispensing device |
US20110242156A1 (en) * | 2010-04-01 | 2011-10-06 | Riso Kagaku Corporation | Inkjet printer |
US8308252B2 (en) * | 2010-04-01 | 2012-11-13 | Riso Kagaku Corporation | Inkjet printer |
US20120105520A1 (en) * | 2010-10-27 | 2012-05-03 | Riso Kagaku Corporation | Inkjet image forming apparatus |
US8550580B2 (en) * | 2010-10-27 | 2013-10-08 | Riso Kagaku Corporation | Inkjet image forming apparatus |
US8888208B2 (en) | 2012-04-27 | 2014-11-18 | R.R. Donnelley & Sons Company | System and method for removing air from an inkjet cartridge and an ink supply line |
US20140253616A1 (en) * | 2013-03-06 | 2014-09-11 | E I Du Pont De Nemours And Company | System and process for liquid replenishment for a printing apparatus for depositing a liquid composition on a backplane |
US9033480B2 (en) * | 2013-03-06 | 2015-05-19 | E I Du Pont De Nemours And Company | System and process for liquid replenishment for a printing apparatus for depositing a liquid composition on a backplane |
US20140326333A1 (en) * | 2013-05-06 | 2014-11-06 | E I Du Pont De Nemours And Company | Liquid replenishment system for a printing apparatus for depositing a liquid composition on a backplane including a dispensing vessel having a self-supporting secondary container |
US9149830B2 (en) * | 2013-05-06 | 2015-10-06 | E I Du Pont De Nemours And Company | Liquid replenishment system for a printing apparatus for depositing a liquid composition on a backplane including a dispensing vessel having a self-supporting secondary container |
US20160368015A1 (en) * | 2014-10-01 | 2016-12-22 | Sekisui Chemical Co., Ltd. | Liquid ejection device |
US10632491B2 (en) * | 2014-10-01 | 2020-04-28 | Sekisui Chemical Co., Ltd. | Liquid ejection device |
US10195867B2 (en) | 2014-11-14 | 2019-02-05 | Hewlett-Packard Development Company, L.P. | First and second reservoirs for printable compositions |
US10137691B2 (en) | 2016-03-04 | 2018-11-27 | R.R. Donnelley & Sons Company | Printhead maintenance station and method of operating same |
US10124597B2 (en) | 2016-05-09 | 2018-11-13 | R.R. Donnelley & Sons Company | System and method for supplying ink to an inkjet printhead |
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